Add pretty-printer output

[harningt]

The output mechanism should support pretty-printing. Example output can be found at:

• http://www.jsonlint.com/
• http://docs.python.org/library/json.html

From the python library, sorted object keys is also a desirable feature.

[harningt]

Looking at this, this would likely require an overhaul of the encoding library. The current generation mechanism may need to be replaced w/ a utility to perform encoding directly in code as opposed to generating templates/etc. Benchmarks would be very important to measure performance changes.

[agladysh]

No luck so far?